Magnetic recording and reproducing apparatus

Abstract

A magnetic recording and reproducing apparatus includes a magnetic recording medium including a recording layer in which at least two magnetic layers are layered on a non-magnetic substrate; and a magnetic head including a main magnetic pole for applying a recording magnetic field in a direction substantially perpendicular to a recording face of the magnetic recording medium and a microwave generating element that generates a microwave magnetic field. The relationship between a thickness Ts of a magnetic layer having a lowest magnetic anisotropy energy among the at least two magnetic layers composing the recording layer of the magnetic recording medium, and a thickness Tt of the recording layer is Ts/Tt≦0.2. The microwave generating element applies the microwave magnetic field having a width broader than the width of the recording magnetic field generated by the main magnetic pole of the magnetic head to the magnetic recording medium.

What is claimed is: 
     
       1. A magnetic recording and reproducing apparatus comprising:
 a magnetic recording medium including a recording layer in which at least two magnetic layers are layered on a non-magnetic substrate; and 
 a magnetic head including a main magnetic pole for applying a recording magnetic field in a direction substantially perpendicular to a recording face of the magnetic recording medium and a microwave generating element that generates a microwave magnetic field, 
 wherein, relationship between a thickness Ts of a magnetic layer having a lowest magnetic anisotropy energy among the at least two magnetic layers composing the recording layer of the magnetic recording medium, and a thickness Tt of the recording layer is Ts/Tt≦0.2, and 
 wherein the microwave generating element has a width broader than a width of the main magnetic pole of the magnetic head, so that the microwave generating element applies the microwave magnetic field having a width broader than the width of the recording magnetic field generated by the main magnetic pole of the magnetic head to the magnetic recording medium. 
 
     
     
       2. The magnetic recording and reproducing apparatus according to  claim 1 ,
 wherein the microwave generating element is a strip line a width of which at a tip at a medium opposing face side in a track width direction is longer than a width of the main magnetic pole in the track width direction. 
 
     
     
       3. The magnetic recording and reproducing apparatus according to  claim 1 ,
 wherein relationship between a microwave magnetic field strength Hac at a position corresponding to a center position of a trailing end of the main magnetic pole at a center position of the recording layer in a thickness direction and an effective magnetic anisotropy field Hk_eff of the recording layer is Hac≦Hk_eff/10. 
 
     
     
       4. The magnetic recording and reproducing apparatus according to  claim 1 ,
 wherein an effective magnetic anisotropy field Hk_eff of the recording layer of the magnetic recording medium is 10 kOe≦Hk_eff≦30 kOe.